問78
頻出度★☆☆
PCのOSに関する記述のうち, 適切なものはどれか。
平成26年度 春期 ITパスポート試験 問78
テクノロジ系ソフトウェア › オペレーティングシステム
This question's explanation and your answers so far.
解説
問 78
Incorrectア
Incorrect. More than one kind of OS can be installed and booted on a single PC. You can divide the hard disk into several partitions, install a different OS in each partition, and choose one at startup — this is called “multi-boot (dual boot).” In addition, with virtualization software you can run another OS as a guest on top of one OS at the same time.
Incorrectイ
Incorrect. PC OSes that support 64-bit CPUs have already been developed and are widely available. A 64-bit OS can handle a larger memory space than a 32-bit version, and its advantage is that it can make use of large amounts of memory. The statement that it “has not been developed” is contrary to fact.
Incorrectウ
Incorrect. When an OS is upgraded, some applications made for the old version may indeed stop working, but it is not the case that “all” of them stop working. An OS is normally provided with downward (backward) compatibility so that software for the old environment still runs, and most applications can be used as they are. The error lies in the sweeping assertion “all.”
- エ
正解 The correct answer is エ. A PC's OS does not necessarily have to boot from the internal hard disk (HDD/SSD); there are OSes that are stored on external storage devices such as a CD-ROM/DVD or USB memory and can be booted directly from them. Such forms are called a “Live CD” or “Live USB,” and they are often used as a distribution format for Linux systems. The PC boot process works by having the BIOS/UEFI look for bootable media according to the priority order of boot devices, so if you set the optical drive or USB to a higher priority, you can boot without using the OS on the internal disk. This method is actually used for installing a new OS, repairing a PC with a failed hard disk and rescuing its data, checking for viruses, and trying out an OS without changing the PC's environment, so the statement is appropriate.
ここがポイント
- A PC's startup (boot) works by having the BIOS/UEFI look for boot media according to the priority order of boot devices, so besides the internal hard disk, an OS can also be booted from a CD-ROM/DVD or USB memory (Live CD / Live USB). This is used for installation, recovery and data rescue when a failure occurs, virus checking, and so on.
- In general-knowledge questions about OSes, sweeping and absolute statements such as “only …” or “all … will stop working” are often wrong. Keep in mind that multiple OSes can coexist through multi-boot (dual boot) or virtualization, that 64-bit-capable OSes are widespread, and that most software still runs after an OS update thanks to downward compatibility.
用語